On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?
A. We cannot say; the number of Mappers is determined by the RsourceManager
B. We cannot say; the number of Mappers is determined by the ApplicationManager
C. We cannot say; the number of Mappers is determined by the developer
D. 30
E. 3
F. 10
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